Method of access and mobility management function (amf), method of user equipment(ue), amf and ue

Abstract

[Problem]This disclosure addresses how to define a mechanism for allocating the most suitable network slice to the UE or UE's PDU session in certain scenarios if a requested network slice from the UE is not allowed due to the Network Slice Admission Control.SolutionA method of an Access and Mobility management Function (AMF) apparatus includes receiving, from a User Equipment (UE), first information related to a first network slice and second information related to a second network slice, and sending, to a Session Management Function (SMF) apparatus, the second information to establish a Protocol Data Unit (PDU) session on the second network slice in a case where the first network slice is overloaded.

What is claimed is: 
     
         1 . A method of an Access and Mobility management Function (AMF), the method comprising:
 receiving, from a User Equipment (UE), first Single Network Slice Selection Assistance Information (S-NSSAI); and   sending, to a Session Management Function (SMF), a second S-NSSAI during a Protocol Data Unit (PDU) session establishment procedure,   wherein the second S-NSSAI is used to replace the first S-NSSAI in a case where the first S-NSSAI is not available.   
     
     
         2 . The method according to  claim 1 ,
 wherein the second S-NSSAI is sent to proceed the PDU session establishment procedure using the second S-NSSAI.   
     
     
         3 . The method according to  claim 1 ,
 wherein the SMF is selected based on the second S-NSSAI.   
     
     
         4 . The method according to  claim 1 , further comprising:
 receiving notification in a case where the first S-NSSAI is available.   
     
     
         5 . The method according to  claim 1 , further comprising:
 receiving, from the UE, the second S-NSSAI.   
     
     
         6 . The method according to  claim 1 , further comprising:
 sending, to the UE, the second S-NSSAI.   
     
     
         7 . The method according to  claim 1 , further comprising:
 receiving, from a Policy Control Function (PCF), the second S-NSSAI.   
     
     
         8 . A method of a User Equipment (UE), the method comprising:
 communicating with an Access and Mobility management Function (AMF); and   sending, to the AMF during a Protocol Data Unit (PDU) session establishment procedure, first Single Network Slice Selection Assistance Information (S-NSSAI) and second S-NSSAI,   wherein the second S-NSSAI is used to replace the first S-NSSAI during the PDU session establishment procedure in a case where the first S-NSSAI is not available.   
     
     
         9 . The method according to  claim 8 ,
 wherein the second S-NSSAI is sent to proceed the PDU session establishment procedure using the second S-NSSAI.   
     
     
         10 . An Access and Mobility management Function (AMF) comprising:
 at least one memory; and   at least one hardware processor coupled to the at least one memory,   wherein the at least one hardware processor is configured to:
 receive, from a User Equipment (UE), first Single Network Slice Selection Assistance Information (S-NSSAI); and 
 send, to a Session Management Function (SMF), a second S-NSSAI during a Protocol Data Unit (PDU) session establishment procedure, 
   wherein the second S-NSSAI is used to replace the first S-NSSAI in a case where the first S-NSSAI is not available.   
     
     
         11 . A User Equipment (UE) comprising:
 at least one memory; and   at least one hardware processor coupled to the at least one memory,   wherein the at least one hardware processor is configured to:
 communicate with an Access and Mobility management Function (AMF); and 
 send, to the AMF during a Protocol Data Unit (PDU) session establishment procedure, first Single Network Slice Selection Assistance Information (S-NSSAI) and second S-NSSAI, 
   wherein the second S-NSSAI is used to replace the first S-NSSAI during the PDU session establishment procedure in a case where the first S-NSSAI is not available.   
     
     
         12 - 56 . (canceled)